A financial industry trade association that lost its challenge to Obama administration regulations that confront conflicts of interest in the retirement-advice market is renewing its push to stop the rules from taking effect next April.

The National Association for Fixed Annuities on Tuesday urged a Washington federal appeals court to freeze the U.S. Labor Department’s “fiduciary rule” to let the group, represented by Bryan Cave, mount its appeal. The new rules require retirement investment-advisers to put their clients’ best interest before profits.